单项选择题

（） some of the tasks done by man before, computers are sometimes called thinking machines.

A．Taking over
B．To have taken over
C．To take over
D．To be taken over

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单项选择题
Plato believed (that) if we (rely on) our senses, we would not be able (to acquire) true knowledge of (the universe).（）

A.that
B.rely on
C.to acquire
D.the universe
单项选择题
The main boyhood (interesting) of (psychologist) Jean Piaget (was) the observation of animals (in their) natural habitat(栖息地).（）

A.interesting
B.psychologist
C.was
D.in their
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